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rest: Reject truncated hex txid early in getutxos parsing

Placeholder github Source User requested to merge github/fork/maflcko/2407-rest-txid into master

In rest_getutxos truncated txids such as aa or ff are accepted. This is brittle at best.

Fix it by rejecting any truncated (or overlarge) input.

Review note: This also starts a major refactor to rework hex parsing in Bitcoin Core, meaning that a few refactor commits are included as well. They are explained individually in the commit message and the work will be continued in the future.

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